Surviving among angels and devils means training and fighting for Issei Hyoudou, who must also hide his new life from his friends and family. Now a servant of Rias Gremory, a high-ranking devil and senior at his school, he joins the school's Occult Research club under her direction.
Before becoming involved in this violent supernatural world, Issei spent his time peeping on women and fantasizing about a harem of his own. A beautiful girl's invitation to a date seemed like good fortune—until she revealed herself as a fallen angel and killed him. Rias brought him back to life, making him her servant in the process. As Issei adjusts, his adventures with his new comrades bring risqué mishaps and comedy alongside the struggle to stay alive.
